Rocksilk® Flat Roof Slab Extra is a BBA certified Rock Mineral Wool slab with a thermal conductivity of 0.038 W/mK and the highest mechanical performance in the range. It is specially designed for use in mechanically fixed flat roof build-ups onto all types of roof decks, providing exceptional thermal and acoustic insulation. The product is non-combustible, achieving the best possible Euroclass A1 reaction to fire classification. The manufacturing process employs Knauf Insulation's advanced Krimpact® Technology, resulting in a highly durable insulation solution with excellent compressive strength and dimensional stability.